Fix bad quoting of python-shell-interpreter
`python-shell-calculate-command' was using `shell-quote-argument' as if it was generating a shell command, but its callers don't pass the result to a shell, and they expect to parse it with `split-string-and-unquote'. This caused problems depending on the flavor of shell quoting in effect (Bug#25025). * lisp/progmodes/python.el (python-shell-calculate-command): Use `combine-and-quote-strings' to quote the interpreter, so that it can be parsed by `python-shell-make-comint' successfully using `split-string-and-unquote'.
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